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                Elasticsearch 集群配置
              
            
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        <p>为了实现Elasticsearch的高可用，以及扩容Elasticsearch的存储能力，单节点已经不能满足我们对Elasticsearch功能的需求，这个时候，Elasticsearch集群解决我们的问题。</p>
<h2 id="1、安装配置Elasticsearch"><a href="#1、安装配置Elasticsearch" class="headerlink" title="1、安装配置Elasticsearch"></a>1、安装配置Elasticsearch</h2><p><a href="http://shuhao.gitee.io/blog/2017/12/13/Elasticsearch%E5%AE%89%E8%A3%85/" target="_blank" rel="external">Elasticsearch安装配置</a></p>
<h2 id="2、修改集群配置"><a href="#2、修改集群配置" class="headerlink" title="2、修改集群配置"></a>2、修改集群配置</h2><p>修改 $ES_HOME/config/elasticsearch.yml</p>
<p><em>主节点配置</em><br><figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">cluster.name: wali</span><br><span class="line">node.name: wali_master</span><br></pre></td></tr></table></figure></p>
<p><em>从节点配置</em><br><figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">cluster.name: wali</span><br><span class="line">node.name: wali_slave_1</span><br><span class="line">discovery.zen.ping.unicast.hosts: [&quot;127.0.0.1&quot;]</span><br></pre></td></tr></table></figure></p>
<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">cluster.name: wali</span><br><span class="line">node.name: wali_slave_2</span><br><span class="line">discovery.zen.ping.unicast.hosts: [&quot;127.0.0.1&quot;]</span><br></pre></td></tr></table></figure>
<p>cluster.name： 集群的名字，集群中所有节点改配置一样<br>node.name：节点的名称<br>discovery.zen.ping.unicast.hosts: 集群中主节点的host</p>
<p><a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.1/important-settings.html" target="_blank" rel="external">Elasticsearch配置文件详解</a></p>
<p>配置好后，分别启动集群中的节点。集群启动</p>
<h2 id="3、查看集群的状态"><a href="#3、查看集群的状态" class="headerlink" title="3、查看集群的状态"></a>3、查看集群的状态</h2><figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">curl http://127.0.0.1:9200/_cluster/health?pretty</span><br><span class="line"></span><br><span class="line">&#123;</span><br><span class="line">  &quot;cluster_name&quot; : &quot;wali&quot;,</span><br><span class="line">  &quot;status&quot; : &quot;green&quot;,</span><br><span class="line">  &quot;timed_out&quot; : false,</span><br><span class="line">  &quot;number_of_nodes&quot; : 2,</span><br><span class="line">  &quot;number_of_data_nodes&quot; : 2,</span><br><span class="line">  &quot;active_primary_shards&quot; : 10,</span><br><span class="line">  &quot;active_shards&quot; : 20,</span><br><span class="line">  &quot;relocating_shards&quot; : 0,</span><br><span class="line">  &quot;initializing_shards&quot; : 0,</span><br><span class="line">  &quot;unassigned_shards&quot; : 0,</span><br><span class="line">  &quot;delayed_unassigned_shards&quot; : 0,</span><br><span class="line">  &quot;number_of_pending_tasks&quot; : 0,</span><br><span class="line">  &quot;number_of_in_flight_fetch&quot; : 0,</span><br><span class="line">  &quot;task_max_waiting_in_queue_millis&quot; : 0,</span><br><span class="line">  &quot;active_shards_percent_as_number&quot; : 100.0</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>从返回的信息可以看出<br>集群名称为：wali<br>status: green 集群状态为正常。（状态有三种情况：green 、 yellow、 red）<br>number_of_nodes 共有两个节点<br>active_primary_shards 主分片数。默认一个机器上有5个分片，所以这里共有10个分片<br>active_shards 分片数。因为Elasticsearch为每个主分片都备份一个分片，所以共有20个分片</p>
<p><a href="https://elasticsearch.cn/book/elasticsearch_definitive_guide_2.x/cluster-health.html" target="_blank" rel="external">集群状态</a></p>

      
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